Signaling device



C. B. HARLOW.

SIGNALING D EVICE.

APPLICATION FILED NOV-21,1917.

Patented Nov. 30, 1920.

2 SHEETS-SHEET 1.

C. B. HARLOW.

SIGNALING DEVICE. APPLICATION FILED NOV. 21. I9II.

Patented NOV. 30, 1920.

' 2 SHEETS-SHEET 2.

i 17206 f 7" I CZWRCaBYfCk/fZOZQ I m I UNITED STATES CLARENCE B. HARLOW, OF CHICAGO, ILLINOIS, ASSIGNOR TO BENJAMIN ELECTRIC PATENT OFFICE.

MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SIGNALING DEVICE.

Specification of Letters Patent.

Application filed November 21, 1917. Serial No. 203,074. I

noise occasioned by the operation of machinery and the like.

One of the objects of my invention is to provide a signal of this character which can be used on high voltages without danger of the parts breaking down as a result of the high voltage current used, and which will produce a clear and penetrating note which can be heard above the other sounds in factories and like noisy places.

For the purpose of disclosing my invention, I have illustrated one embodiment thereof in the accompanying drawings, in which Figure 1 is a side elevation of a signal embodying my invention;

Fig. 2 is'an enlarged side elevation of the operating parts of my signal, certain of the parts, however, being shown in section Fig. 3 is a sectional View taken on the line 33 of Fig. 2;

Fig. 4 is a detail sectional view of the electromagnet and its associated parts;

Fig. 5 is an enlarged perspective of the armature of the electromagnet and. the circuit interrupter operating finger;

Figs. 6 and 7 are enlarged detail viewsof the anvil secured on the diaphragm of my signal;

Fig, 8 is a'detail view of the means for securing the armature in position on the dia hragrn; c

ig. 9 is an enlarged perspective view of the core piece of the electromagnet; and v Fig. 10 is a diagrammatic view of the c1rcuit arrangement of the I In the signal disclose I providea two+ part casing comprisingthe front 1, which is slightly dished at its center and prov'ided with a central aperture from WhlChPKOJfiCiZS a suitable resonator 2. All of the signal parts of my horn. 7

parts are mounted on the front 1. The

sound-producing member consists of adiaphragm 3 mounted upon the front 1. of the casing behind the opening, a suitable spacing ring 4, preferably of cardboard, fiber, or the l1ke being placed between the diaphragm at its edge and the front 1. This diaphragm is provi ed with a centrally disposed adj ustable anv1l 5 in the form of a screw, which is mounted in a hollow, internally screwthreaded post 6 mounted upon the diaphragm- One end of this post is reduced and projects through the diaphragm, being riveted over a washer 7 to rigidly hold the post in position. The post is spht at 8 and the sides pinched together, so that while the screw may be adjusted it is held clamped against accidental movement. The head of the screw projects into the resonator and is, therefore, adjustable through the resonator without opening the casing.

The vibrating hammer for striking the diaphragm comprises an armature 9 of an electromagnet. This armature is mounted on a vibratile member in the form of a spring disk 10, likewise mounted on the front 1 and spaced apart from the diaphragm 3 by a spacing ring 11. Air escape openings 12 are formed in the disk 10, so that there will be no confined body of air between it and the diaphragm.

This armature is vibrated by an electromagnet, supported by a pair of arches 14: having their legs secured to a clampin ring 15. The electromagnet is preferably in the form of a plurality of triangular laminations 16 laid fiatwise to form the core of the magnet. These laminations, which are preferably punched or stamped from sheet metal,

are clamped directly upon each other and 't'errupted by the circuit-interrupter 21 comprising a pair of spring members 22 and 23 arranged one above the other and mounted on a post 24: on the clamping ring. The con- Patented Nov. 30, 1920.

tacts 25 on these springmembers have a normal tendency to separate and the springs are insulated from one another by insulating washers 26 and from the post by a suitable insulating bushing. The contacts of the spring are moved into engagement, when the armature is released by its magnet, by a finger 27 mounted on the armature and extending over the top of the spring 22, an insulating button 28 being mounted on the finger to insulate it from the spring. The normal tendency of the springs is to separate the contacts, and as the armature is attracted by its magnet the pressure of the finger 27 is removed, permitting the opening of the circuit through the magnet windings.

The normal separation of the springs is adjusted by an adjustable finger 29 below the spring 23 and provided with an insulating button 30 on which the spring rests. This finger extends from an arm 31 clamped on a vertical supporting leg 32 extending from a cross-arm 33 mounted on one of the arches 14. The arm 31 is slotted to permit its adjustment on the clamping screw 34 and is adjustably moved by a screw 35 on an arm 36 engaging in a finger 37 on the arm 31, a lock nut 38 being provided to hold the screw from turning when once set.

Mounted on one of the arches 14 is an insulating bar 39 which carries a pair of binding plates 40 connected to the coils of the magnet and carries binding-posts 41 to which the leading-in wires may be connected.

The clamping ring 15 is secured to the front by suitable screws 42 which pass through the front 1, the diaphragm 3, the spacer ring 4, the disk 10, and into the clamping ring, thereby securing all of the parts to the front 1 of the casing.

The cover 43 of the casing is preferably cast of aluminum and is provided with a flange 44 having screw openings into which screws 45 passing through the front 1 may be secured for holding the front in place. This cover is also provided with a pair of supporting lugs 46 by which it may be secured to a suitable support, the back of the cover being flattened to permit it to fit snugly against its support. A suitable opening 47 is provided in one side of the cover for the leading-in wires and this opening is internally screw-threaded and of sufiicient size to receive the end of the supply wire conduit.

The circuit connections for my horn are shown diagrammatically in Fig. 10. As will be seen from this figure, the vibrator contacts are connected between the two magnet coils, whereby. the vibrator springs are protected on high-voltage circuits by the windings. Furthermore. the danger of the various insulating washers used on the post 24 breaking down in high voltage work is prevented.

It will also be seen that the condenser 20 is connected directly across the contacts so that the condenser acts to prevent sparking at the contacts.

By arranging the hammer so that it strikes the anvil on the diaphragm when released by the armature, instead of being operated on its striking movement by the armature, as is usually the case in signals of this character, I am enabled to produce a better note than heretofore. Due to the fact that the armature generally comprises a comparatively heavy piece of iron, the movement of the resilient support is somewhat sluggish, and if its resiliency alone were depended upon, its return movement after striking its blow would be slower than the natural rate of vibration of the diaphragm. However, as soon as the blow is struck the circuit of the magnet is closed and the movement of the spring is assisted by the magnet, thereby retracting the armature rapidly and permitting a free vibration of the diaphragm.

Also, by mounting the armature on a disk instead of an elongated vibratile reed or spring, the bending strain is so distributed that the danger of crystallization of the vibratile member is eliminated and breakage prevented. At the same time, by drawing the poles of the magnet together, as shown, the size of the armature is reduced, permitting a quicker movement of the disk due not only to the decrease in weight but to the decrease in the area of the disk covered by the armature.

Furthermore, the vibrating movement of the springs of the circuit-breaker is reduced to a minimum and they have a minimum strain placed upon them, because, instead of being always under tension, as would be the case if they moved to closed position, when the armature is attracted, in the structure illustrated they assume forpart of the time their normal position.

Having thus described my invention. what I claim as new and desire to secure by Let-. ters Patent is t 1. In a device of the character described, the combination with a casing having means for mounting the same upon a support and a conduit connecting opening therein. of a dished cover plate secured to the front of said casing and having a sound opening therein. a diaphragm secured to the cover plate having a centrally arran ed anvil thereon, a spacing clamping ring for said diaphragm, a resilient disk mounted upon said clamping ring. a flat. relatively heavy armature centrally mounted on said disk, a clamping ring for said disk, means for securing said clamping rings to said cover plate, a pair of spaced-apart arches having their legs secured to said clamping rings, a horseshoe electromagnet having its base secured between said arches and supported thereby and having its poles facing and ad jacent said armature, a circuit-breaker also mounted on said clamping rings comprising a pair of contact-carrying flat springs stressed to open the contacts, and an arm carried by said armature overlying the springs and arranged to move the springs to close the contacts when the armature is released by the magnet.

2. In a device of the character described, the combination with a diaphragm having a centrally disposed anvil thereon, of a clamping ring for said diaphragm, a spring disk mounted behind said diaphragm, a clamping ring for said disk, a relatively heavy flat armature mounted on said spring disk, a pair of arches having their legs secured to said second clamping ring, a horseshoe electromagnet having its base secured between said arches and supported thereby and having its poles facing and adjacent said armature, an insulating strut secured to the legs of one of said arches, binding terminals mounted on said strut and connected to the terminals of the wind ings of said magnet and carrying binding-posts for the leading-in wires, a pair of flat contact-carrying springs stressed to open said contacts mounted on said second-mentioned clamping ring, and an arm mounted on said armature and overlying said springs for closing said contacts when the armature is released by the electromagnet.

3. In a device of the character described, the combination with a diaphragm having a centrally disposed anvil, of a clamping ring therefor, a spring disk mounted behind said diaphragnn'a clamping ring therefor, an armature mounted on said spring disk and centrally disposed, a pair of spaced-apart arches having their legs secured to said second-mentioned clamping ring, a horseshoe electromagnet having its base secured be tween said arches and its poles facing and adjacent said armature, a post mounted on said second-mentioned clamping ring, a pair of spaced-apart flat contact-carrying springs mounted on said post and stressed to open said contacts, a strut secured to the legs of one of said arches and having a depending arm thereon, an adjusting member for said contact springs adjustably mounted on said arm, and an arm secured to said armature and overlying said springs and moving the same to close the contacts when the armature is released by said magnet.

et. In a device of the character described, thecombination with a diaphragm having a centrally disposed anvil, of a clamping ring therefor, a spring disk mounted behind said diaphragm, a clamping ring for said disk, a fiat armature centrally secured to said disk, a pair of arches mounted on said disk clamping ring, a horseshoe electromagnet having its base secured between said arches and its poles facing and adjacent said armature, a post mounted upon said disk clamping ring, a pair of flat spaced-apart contact-carrying springs mounted on said post stressed to separate said contacts, a strut secured to the legs of one of said arches and having a transversely extending arm and a depending arm, a U-shaped adjusting member adjustably mounted on said depending arm having one leg arranged beneath said springs for adjusting the same, a screw extending through the transverse arm on the strut and engaging the opposite leg of said adjusting member for holding the same in its adjusted position, and an arm mounted on said armature and overlying said springs to close the contacts when the armature is released by said magnet.

In witness whereof I have hereunto sub scribed my name.

CLARENCE B. HARLOW.

Witnesses P. D. PHILLIPS, \V. D. STEELE. 

